Examine source code of Open delivery box icon

{
  "manifest_version": 2,
  "name": "Open delivery box icon",
  "version": "1.0",
  "description": "The open delivery box symbol is often used to guide the recipient on how to open the package properly to: Avoid damaging the product inside, Ensure safety when opening...",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Click me!"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ea0f3697-71c6-4b36-9235-9fe65a51754f}"
    }
  }
}